Elektron Musical Instruments

has anyone ever heard of a device like the sidstation that uses POKEY 
chips (some atari computers used em, (800, 400, et al...) and they 
are capable of some pretty cool sounds in their own wright, 
especially when you make them do things they arent supposed to.

i could have sworn i saw something like this circa 1996, but maybe i 
just dreamed it?

i know theres at least 1 synth-tracker maker for gameboy 
(nanoloop.com), does anybody know of any other videogame system hacks 
like this?

(i recall that the intellivision made some cool sounds, and of course 
the venerable atari 2600 did.)

rs